Method of mounting erasers within holder members



Nov. 8, 1927.

A. BIENENSTEIN METHOD OF MOUNTING ERASERS WITHIN HOLDER MEMBERS Filed June 8, 1927 n I W 1? m/i w Patented Nov. 8, 1927.

' U151 ATES ANDREAS nrnnnns'rnrlv, or To EDo', onto; Assn-non TO THE oolvzrnriv' run MANU- FAGTURING-COMPANY, on TOLEDO, OHIO, A CORPORATION or omo.

METHOD or vrouu'rnve nnAsnRs WITHIN nonnnnivrnivmnns.

Application filed. Inns 8,

"i The invention relates to the mounting of v yieldable members, such, for instance, 7 as rubber eraser-s, within ferrules or hollow holder-members having an open end' formed with a restricted mouth.

Heretofore erasers have been retained in ferrules by threaded engagement, internal annular ribs or struck-out tongues. In many cases these devices are not satisfactory for securing the erasers in position. i 7

An object of this invention is to provide a simple and efficient ,method of mounting erasers within holding members.

A further object is to provide a new and improved method. of assembling yieldablie solids and unyielding holding" members which lends itself to increased production with an attendant reduction in cost. v

Further objects will hereinafter appear.

For illustrative purposes the invention is shown in the accompanying drawings, in

, which portionof the parts;

- Fig. 1 is a vertical sectional elevation. of. an apparatus for assembling rubber erasers and metal or unyielding ferrules; Fig. 2 is a View similar to Fig. 1, but showing a different Fig. 3 is a top'plan view of the part for holding the ferrule; and Fig. & is an. enlarged elevation partly in section of the assembled eraser and ferrule.-

In the illustrated embodiment of the invention, there is shown. in Fig. at an assembly of a ferrule 2 and rubber eraser 1,, and it will be observed that one end. of the ferrule is formed with an inturned flange 3, providing a restricted mouth which securely grips and retains the eraser 1 in place, a portion of the eraser projecting beyond the end of the ferrule for erasing purposes. The. ferrule 2 may be a sheet metal or other substantially unyeilding material, and the eraser cylinder may be of rubber or material having similar resilient and yieldable characteristics.

Heretofore, it has been a tedious and troublesome task to assemble the ferrule 52 and eraser 1, but in accordance with this invention the procedure is greatly simplified. In carrying out my method, I provide a block t having in its upper portion an outwardly flaring or tapering passage 5, the lower end of which terminates in a transversely extending opening 6 having anopen outer end. The upper end portion of the 1-927. .S'efial No. 197,376. K

passage 5' is substantially the size of the eraser, but the lower end thereof is somewhat smaller so that forcing the eraser through the passage a portionis constricted. I

In register with thetaperin'g' passage and below the transverse opening "6-, is a dis charge passage 7 through which the as sen 'blecl erasers andferrules are discharged.

A leveror bar 8 is movable in and out of the transverseopening 6 in the block 4 and is" formed in; its outer end' with a recessed portion prov ding ashelf or'le'dge 9 shaped to receive a ferrule 2, as more clearlysh-own in. Fig. 3. The lever 8 may be movedmanually or mechanically inand out of theoprning 6" at recurrent intervals, but as the particular form of actuating means formsno part of the" presentinventiomdetailed' de scription is not considered necessary.

In operation, a ferrule isfirst placed on the shelf 9 of the lever 8 with the restricted mouth uppermost. It may be here stated that the diameter of the restricted mouth of. the ferrule is approximately the same as the diameter of the-smaller end ofthe ta'per- 5 ing' passage 5. By inserting the'le'ver into the opening 6 of the hlock 5, the restricted mouth of the ferrule is brought into register with the smaller end of'th-epassage 5.

' An eraser may be then placed in the pas- V sage 5, and means of a plunger .10, manually or mechanically operated as desired, the eraser is forced through the smaller end of the taperingpas'sageand into the ferrule. I

The portion of the eraser entering the re-- stricted mouthof the ferrule is so constricted that it willreadily pass into the ferrule, but owing to the resiliency of the material, will then expand to engage the sides of the/ferru e.

After the eraser has been forced to the end of the ferrule, a portion still remains in the tapering passage 5, and this portion holes the ferrule in place when the lever 8 is withdrawn from the opening-6. Thereafter the plunger is forced farther into the tapering opening to eject the eraser therefrom and the assembled unit drops from V I quired to practice this method owing to its marked simplicity, and it therefore is adapted for quantity production. 1

, While I have shown and described my invention in connection with erasers and ferrules, it is to be understood that it can'be' used to advantagein the assembly of any yieldable solid and a relatively unyielding annulus. Numerous changes in details of the described method may be effected with- I out departing from the spirit of the invention. lVhat I claim as new and desire to secure by Letters Patent is: i

1. The method of assembling a yieldable solid and an unyielding ferrule having a restricted open end smaller than thecylinder which consists in constricting an end portionof the solid so that the extreme end is of approximately the diameter of the re-' stricted opening in the ferrule, and con comitantly forcing the constricted end of the solid through the restricted opening into the ferrule.

2. The method of assembling a cylinder and ferrule having a restricted mouth which consists in forcing a cylinder through a tapering passage in register, with the restricted mouth of the ferrule, the passage being approximately the size of the restricted mouth. I i

3. The method of assembling a yieldable cylinder and ferrule having an inwardly .flanged mouth consisting in providing an ly the same size as said restricted opening,

placing the ferrule with said restricted open ing in register with the smaller end of said passage, and forcing the cylinder-through the passage into the ferrule.

5. The method of assembling a yieldable cylinder and a ferrule having a restricted opening of less diameter than the diameter of the cylinder which consists in providing a tapering passage with the smaller end thereof approximately the same size as the I restricted opening of the ferrule, supporting a ferrule with the restricted opening in register with smaller end of said passage, and forcing thecylinder through said passage into said ferrule.

6. The method of assembling a'yieldable cylinder and a ferrule having a restricted open end smaller than the cylinder which 7 consists in providing a tapering passage with the smaller end thereof approximately the size of the restricted open end of the ferrule, supporting the ferrule with the restricted open end in register with the smaller end of the tapering passage, forcing the cylinder through the passage into the ferrule, removing the support for the ferrule, and subsequently discharging the assembled cylinder and ferrule.

7. The method of assembling a yieldable cylinder and a ferrule having a restricted open end smaller than the cylinder, which consists in providing a tapering passage with the smaller end thereof approximately the size of the restricted open end of the ferrule, supporting the ferrule with the restr-ic ted open end in register with the smaller end of the tapering passage, forcing a portionof the cylinder through the passage into the ferrule with a portion of the cylinder remaining in the'passage, removing the support for the ferrule, and discharging the re-' mainder of the cylinder from the passage. fIn testimony whereof I have hereunto signed my nameto this specification.

ANDREAS BIENENSTEIN. 

